Machine Controls
ists can stop the program, withdraw the tool, and inspect or modify as needed, Drane noted. “Without changing screens, users can modify the tool offset and automatically reposition to the point in the program where it was interrupted, then con- tinue on within the program with the new offset active,” Drane noted. “He even has the ability to retrace backwards through the program, which is a useful resource for tool-breakage situ- ations. These features are created with only one thing in mind, effi ciency. Rather than a complete program stop and restart, machinists are able to interactively make necessary modifi ca- tions while in-process.”
Other key trends in CNCs today include newer advanced volumetric compensation capabilities, he added, where all degrees of motion are intelligently compensated, and other advancements with in-part gaging, collision detection and nanometric positioning resolution. “The real trend is refi ning the speed and performance of a machine tool to provide the customer with the best possible performance,” Drane said.
Aimed at job shops and retrofi ts, the new Siemens Sinu- merik 808D entry-level CNC offers a cost-effective upgrade path for two- and three-axis knee-mill style machine tools.
Faster processing on today’s CNCs gives operators the ability
to micro-manage the machining process in real time, he added. “In the past, a servo command was presented to the drive, it would begin its execution, the CNC would read the position as provided by the encoder and then update the servo with a new command. Nowadays, this process seems almost cryptic,”
“K” GRADIENT MIX: DARK BLUE PMS: 2935 U C: 92 M: 65 Y: 0 K: 0
LIGHT BLUE PMS: 306 U C: 75 M: 5 Y: 3 K: 0
NORTHTECH PMS: 2935 U C: 92 M: 65 Y: 0 K: 0
100% BLACK
ORIGINAL JP: DIC579 C: 92 M: 59 Y: 1 K: 0
74
ManufacturingEngineeringMedia.com | April 2013
Photo courtesy Siemens Industry Inc.
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